Friction device for hand-threading shuttles



April 23, 1929. H DAVQL 1,710,018

FRICTION DEVICE FOR HAND THREADING SHUTTLE-S I Filed Oct. 27, 1927 2 Sheets-Sheet l INVENTOR.

- ATTORNEY.

Patented Apr. 23,1929.

UNITED STATES PATENT OFFICE.

HARRY ALTON DAVOL, 0F METHUEN, MASSACHUSETTS, ASSIGNOR TO U. S. BOBBIN &; SHUTTLE 00., OF PROVIDENCE, RHODE ISLAND, A CORPORATION RHOIDE ISLAND.

. FRICTION nnvrcn FOR HAND-THREADING SHUTTLES.

Application filed. October 27. 1927. Serial No. 229,201.

for shuttles.

This invention is one of the type of devices in which there are friction plates pressed together by a spring, the pressure of which can be adjusted by a screw.

This present device applies to a hand threader in which the threading slot is 01' wood, and its principal advantages are as follows:

The number of parts is reduced to four and they are so positioned that they can be easily removed and easily adjusted while they are "so arranged that the parts are not closely fitting but preferably float whereby the danger of the thread cutting grooves 1s largely avoided.

My device combines simplicity, ease of adjustment and suitability for certain classes of work. i I

In the drawings, Fl 1 is a plan view sho wing the eye end '01 a shuttle with my devlce in place.

Fig. 2 is an elevation from the side opposite the shuttle eye, which is the side through which the thread passes, of a shuttle before my friction device is put 111 place. i Fig. 3

to Show the interior.

- Fig. 1 is a view similar to Fig. 3 ot the opposite side from that shown in Fig. 2, betore the :t'riction device put 111 place.

Fig. 5 is a sectional view looking on the line 55 oi? Fig. 51. i

Fig. 6 an elevation similar to Fig. 3 but with no part of the wood broken away.

Fig. 7 is a sectional view showing myde vice with one type of screw pin viewed from the left on the line 7- 7 of Fig. 3.

Fig. 8 is a View looking down on a shuttle equipped with my device,'with part of the wood broken away. q

Fig. 9 is a view similar to Fig. 7 01 a modification.

Fig. 10 is a sectional viewsimlilar to Fig. 5 but with my device in position in a hole of a somewhat di'il'erent type. i

Fig. 11 is a view similar to 6 showing the type of hole such as is also shown in Fig. 10. i

Fig. 12 is a view similar to Fig. my preferred type or screw pin. Fig. 1361s a perspective new of the head of a screw such as shown Fig. 12.

7 showing from which the thread G unwinds.

flat part of bottom plate D.

is an elevation of the eye side of a shuttle with part of the wood broken away,

down

rowed inat 51 to form a neck.

plate Dis flat but from that point, it is In the drawings, A represents a shuttle of i the ordinary hand threading type having a bobbin chamber 10 in which is the bobbin B y 11 is a forward extension of the bobbin chamber 10 and "from the side of this, preferably, which is opposite the outlet eye, Icut into the wood with a curved saw the vertical passage 12 which extends diagonally or in a curve, this slot extending down at 13 as far as the horizontal slot 1 1 which is parallel with and at about the middle of the usual thread groove 15. Extending a little up from slot 14, and inward from the bottom of groove 15 is the shuttle eye or thread hole 16. i

From the opposite side of the shuttle, with an ordinary round boring tool or reamer I cut the thread delivery passage 20 preferably squaring out the bottom at 17 to receive the This delivery passage isat substantially right angles to and connects with the bobbin chamber 10 through slot 9, chamber 11, and it cuts through the slots 12 and 14. I

Resting in thebottom 17 of the thread-delivery passage 20 is the flat part 419 of an eye plate 1) such eye'platc having a pin hole and at the endnext to where the thread is delivered having upstanding guide cars 52 and 53. The front car 52 is the shorter and is so bent as to leave room tor the thread be tween 1t and the edge at 120 of delivery passage 20 while the other or longer car 53 exturning up theseears, the eye plate Dis nar- Up to neck 51 curved at'ears 52 and 58 to fit passage 20.

The end 117 of the cut 17 therefore posi tions plate 1) so that its end does not reach as :tar as the end 200 01? the round bore 20 where- I by as shown in F 7 there is room for the thread C to slip around the end of the car 52.

Eye plate I) has a pin hole 50 through whichpasses the headed screw pin H which also passes down into the hole 19 in the Wood.

This headed pin has a shank 40 which extends through hole 15 into thls hole, an enlarged threaded head 12 and a slot a3, and is countersunk in the hole 14:2 in the wood so that it is entirely out of sight but can readily be reached.

K represents'a Compression spring which encircles shank 4 0 and presses against head sible forth'e thread Cto, get in over the top of the upturned tip of F. plate F in slot 217 and the fact that plate F is "slightly narrower than the width of passage keepsF from turning. I V v By bending car 52 towards the axis of passage 26 or by cutting out at120 betweeneye 16 and passage 20, I can getclearanoefor vthread G to sl p nto position.

The spring 72in; Fig, .9 is of the fiat bow i type preferably almost as wide as the diameter of delivery passage 20, and rests at each 3 13111 hole 73 which bears against a shoulder 173 at the bottom end of the head part 74 of screw pin R, which also has a smooth shank 71 which may be case hardened and extends down through thepin holes 61 and in plates F and D into the-hole 7 O in the wood;

This pin R is countersunk in a hole 76 and head .74 is threaded at 75 and has a turning :slot 77. t v p r In thisview, I show a considerable space betweentheears 152,153 otplate D and the end 200 0'1 passage 20. In any case this d is tance can beregulatedbythe position of the pinholes such as (51 and .50 through the eye plate and friction. plate the pin such as R or H passing througlrthese holes willhold" the plates in the desired position. I p 3 As shown in Fig. 1,:1 may drive the pm 111 down into the wood at the front endot chamber 11 at a point directly in .line with the axis of the bobbin 13: so that the thread O- in UHVV1IlClJL1QilV1ll do so more smoothly or 1 may oniit this in which case the thread as j shown. in Fig 8, will gojdirectly around the Preferably. it is cut away at shank 40 of screw pin H which therefore serves the double purpose. I I g In Figs.10 and 11 Lshowa cylindrical delivery passage 220 which extends entirely through theshuttle A so that-as shownin Fig. l lits end becomes the shuttleeye where it joins thread groove 15. 5- V 221 to allow a clearance for the thread overear a screw pinbut what isperhapsmoreproperly;ascrew bolt indicated by T.

The position of end on plate F which throughits middle has t c In. F igs. 12 and 13 I show what I will still call eyejplate in the deliveryjpassage; a headed slot 162 which is screwed into a hole (38 at the bottom of the shuttle A and has smooth .shank 40 which extends through hole 163 and up through both plates F and D being then threaded at Gite receive the head 170. in the form oi a check nutwhich has a turningv slot 172 and pinching slot 174, and which is of a size to slide through the bore 171. Between headlTO and top plate F is the spring K and as foot 161 is fixed in position,-

I canv change the pressure of spring K by turning head 170 111 or out on screw part 64 of screw pin T.-

To prevent it from turning with head 170, 2

foot 161 may be; stuck or glucdinto position;

I claim: V v .7 1. The combination with a shuttle having .a bobbin chamber and in forward extension thereof a threading slot one portion otwhich extends vertically forward and outwardly in a curve and the otherportion of which extends horizontally through the sideof the shuttle and ends in a thread delivery passage at substantially right anglesto and connectingwith the bobbin chamber; of an eye plate at the bottom of the thread delivery passage, said eye plate having a pin hole and terminating at its outer end inupstanding guide ears forming a delivery eye of which the forward ear has an upper inner edge which slopes up andfout and leaves a clearance for the passage of the thread between it and the wood; a top v friction plate having a pin hole and an upturned inner end, said plate resting on the eye plate in the delivery passage; a headed screw pin whichv passes vertieallyinto the shuttle through saidpin holes and serves as a thread deflector from the bobbin chamber to the thread delivery passage; and a compression springbetween the top plate and the head of the screw pin.

2. The combinationwit-h a shuttle having a bobbin chamber and a threadingslot in extension thereof which ends in a thread delivery passage at substantially right angles to and connecting with the'bobbiu chamber;

delivery passage; said eye plate having a pin hole-and terminating, at its outer end in upstandingguide ears forming a delivery eye the front ear leaving a clearance for the passage of the thread between it and the wood; a top friction plate having a pin hole and an upturl'ied inner end, said plate resting on the screw. pinjwhich passes vertically into the shuttle and through said pin holes; and a compression spring between the top plate and the head of the screw pin.

3. The combination with a shuttle having a bobbin chamber and a threading slot in extension thereof which ends in a thread delivery passage at substantially right angles to and connecting with the bobbin chamber; of an eye plate at the bottom of the thread 10 delivery passage,'said eye plate having a pin hole and terminating at its outer end in upstanding guide ears; a top friction plate having a pin hole and an upturned inner end. said plate resting on the eye plate in the delivery passage; a headed screw pin which passes vertically into the shuttle and through said pin holes; and a compression spring between the top plate and the head of the screw p111.

HARRY ALTON DAVOL. 

